[object, uuid(32bb8320-b41b-11cf-a6bb-0080c7b2d682)]
interface IX : IUnknown {
  HRESULT Fx();
}

[object, uuid(32bb8321-b41b-11cf-a6bb-0080c7b2d682)]
interface IY : IUnknown {
  HRESULT Fy(int x);
}

[object, uuid(32bb8322-b41b-11cf-a6bb-0080c7b2d682)]
interface IZ : IUnknown {
  HRESULT Fz(int x, [out] int * y);
}